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Finding the Fourth Proportional to 539.60, 744.63 and 318.67

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Solution

The fourth proportional to 539.60, 744.63 and 318.67 is: 439.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.60 : 744.63 = 318.67 : x
  2. Step 2: Convert to fraction form
    539.60/744.63 = 318.67/x
  3. Step 3: Cross multiply
    539.60x = 744.63 × 318.67
  4. Step 4: Simplify right side
    539.60x = 237,288.19
  5. Step 5: Solve for x
    x = 237,288.19/539.60
  6. Step 6: Final answer
    x = 439.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.